Dynamies of Soil Organic Carbon Fractions with the Restoration Process of Pinus massoniana Plantation in Eroded Red Soil Region
DENG Cui;L Maokui;ZENG Min;ZHANG Kangjing;REN Yinbang;NIE Yangyi;XIE Jinsheng;Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology;School of Geographical Science,Fujian Normal University;
To study the variation of soil organic carbon in fractions with the restoration process,we selected the different ages of Pinus massoniana plantations as the research object and take the bare land(CK1)and secondary forest(CK2)as the control,which is basically consistent with the similar management histories in erosive red soil area.The physical and chemical fractionation method was applied,three pools were isolated in soil organic carbon.The active carbon was composed of dissolved organic carbon(DOC)and particulate organic matter(POM);the slow carbon was composed of SOC bound to silt and clay and SOC attached to sand particles or occluded in aggregates;the passive carbon is a chemically recalcitrant fraction.The results showed that,in the process of vegetation restoration(0~30years),the storage of active carbon and its distribution proportion in vegetation restoration was significantly improved in the recovery of 7~10year(P0.05),its storage and distribution remained at a relatively stable level in the vegetation recovery of 27~30year;the storage of slow carbon and its distribution was significant changes in the recovery of 27~30year(P0.05).The distribution of active carbon pool was decreased,there was significantly correlated between active carbon pool(POM,DOC)and slow carbon pool(P0.01),indicating that the active carbon pool in the recovery gradually transformed to the slow carbon pool after 7~10year;the stocks of recalcitrant carbon pool continued to increase along with the chronosequences,but its proportion remained relatively stable level.Correlation analysis showed that there was a significant correlation between the chronosequences and the factions with the pools(P0.01),at the same time,the slow carbon pool was the most sensitive in the process of vegetation,indicating that the soil organic carbon in activated carbon accumulation gradually transformed into slow carbon pools accumulation in P.massonianarecovery,thereby affecting the recalcitrant carbonaccumulation,which was good for the long-term preservation of soil organic carbon.
【Fund】： 国家自然科学基金项目(31370465);; 973计划前期专项(2012CB722203)
【CateGory Index】： S153.6
【CateGory Index】： S153.6